New Refractor OTA's! WOW!!

Take a look at this puppy. http://www.istar-optical.com/ Now that's what I call ingenuity. Not for me tho' I'm just too old school. But to many newbies and nonconformists this should be a grand slam! Mike

I wondered about that too John. But Istar eays it plans to market a "sleeve" similar to what dobs use. Some may not see the need tho'. Would depend largely on their immediate surrounds I would guess. They also saw the findings by use of a "rail" scope in testing lenses. If rail scopes don't suffer much from thermals I guess they know what they are doing. I'm no expert. Mike

One of the strong points of the refactor is the fact that it has a closed tube. It keeps the optics clean, tube currents down and stray light out. I wouldn't want the design shown in the example. I really can't see any advantage to that design.